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© NOKIA BSSPAR / 10.05.2006- V3
Explain the motivation for power control
Indicate the BSS parameters required for power control in general (output power levels, fixed step sizes)
Describe the principle steps to be executed for power control (averaging, triggering, power change step size estimation)
Discuss the algorithms used to estimate the power change step size, when the power has to be increased / decreased due to signal level / quality
Explain the motivation for power optimisation
Indicate the BSS parameters required for power optimisation additionally
Discuss, how power control and traffic channel allocation are modified by power optimisation
© NOKIA BSSPAR / 10.05.2006- V3
Realization of power class
Reduced interference on DL/UL
powerCtrlEnabled Y,N
0..32 dBm GSM 1900 CCH
Minimum MS output power
0..36 dBm GSM 1800
0..32 dBm GSM 1900
bsTxPwrMax 0..30 dB GSM 900
bsTxPwrMax1x00 0..30 dB GSM 1800/1900
Minimum MS output power (by maximum attenuation)
bsTxPowerMin 0..30 dB
bsTxPowerOffset 0..30 dB
powerDecrStepSize 2,4 dB
Desired power level can be achieved in 1 or 2 commands
Yes
No power change triggered
Power
Control
Power
Control
pcLowerThresholdsLevelDL/UL
RXLEV_DL/UL > pcLowerThresholdLevelDL/UL - 2 powerIncrStepSize
(BTS)
pcUpperThresholdsLevelDL
variableDLStepUse = No
(MS)
pcUpperThresholdsLevelUL
pcLowerThresholdsQualDL/UL
Actual receive quality RXQUAL_DL/UL
PWR_INCR_STEP = (1 + Max (0,QUAL)) * powerIncrStepSize
QUAL = RXQUAL_DL/UL – pcLowerThresholdQualDL/UL
Take algorithm for power increase due to signal level
Take largest step size
(No Power Optimisation)
Yes
No
Power
Control
pwrDecrLimitBand0 0..38 dB used for quality 0
pwrDecrLimitBand1 0..38 dB used for quality 1
pwrDecrLimitBand2 0..38 dB used for quality 2 and worse
Enable power decrement below optimum level for UL
powerDecrQualFactor 0,1 enabled, if set to 1
Activation of power optimisation
(With Power Optimisation)
PWR_DECR_STEP = Min (pwrDecrLimit, Max (A,B))
A = Max (0, RXLEV_UL - optimumRxLevUL)
B = (powerDecrQualFactor + Max (0,QUAL)) * powerDecrStepSize
with QUAL = pcUpperThreshold - <RXQUAL_UL>
Term A: Would bring actual receive level exactly to optimum level
Term B: Considers difference between average receive quality and threshold quality
Power decrease step size for BTS
PWR_DECR_STEP = Min [Min (pwrDecrLimit, Max (A,B)),10]
Power
Control